/****************************************************************************** * * Module Name: oslibcfs - C library OSL for file I/O * *****************************************************************************/ /* * Copyright (C) 2000 - 2014, Intel Corp. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions, and the following disclaimer, * without modification. * 2. Redistributions in binary form must reproduce at minimum a disclaimer * substantially similar to the "NO WARRANTY" disclaimer below * ("Disclaimer") and any redistribution must be conditioned upon * including a substantially similar Disclaimer requirement for further * binary redistribution. * 3. Neither the names of the above-listed copyright holders nor the names * of any contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * Alternatively, this software may be distributed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * * NO WARRANTY * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGES. */ #include <acpi/acpi.h> #include <stdio.h> #include <stdarg.h> #define _COMPONENT ACPI_OS_SERVICES ACPI_MODULE_NAME("oslibcfs") /******************************************************************************* * * FUNCTION: acpi_os_open_file * * PARAMETERS: path - File path * modes - File operation type * * RETURN: File descriptor. * * DESCRIPTION: Open a file for reading (ACPI_FILE_READING) or/and writing * (ACPI_FILE_WRITING). * ******************************************************************************/ ACPI_FILE acpi_os_open_file(const char *path, u8 modes) { ACPI_FILE file; u32 i = 0; char modes_str[4]; if (modes & ACPI_FILE_READING) { modes_str[i++] = 'r'; } if (modes & ACPI_FILE_WRITING) { modes_str[i++] = 'w'; } if (modes & ACPI_FILE_BINARY) { modes_str[i++] = 'b'; } modes_str[i++] = '\0'; file = fopen(path, modes_str); if (!file) { perror("Could not open file"); } return (file); } /******************************************************************************* * * FUNCTION: acpi_os_close_file * * PARAMETERS: file - An open file descriptor * * RETURN: None. * * DESCRIPTION: Close a file opened via acpi_os_open_file. * ******************************************************************************/ void acpi_os_close_file(ACPI_FILE file) { fclose(file); } /******************************************************************************* * * FUNCTION: acpi_os_read_file * * PARAMETERS: file - An open file descriptor * buffer - Data buffer * size - Data block size * count - Number of data blocks * * RETURN: Number of bytes actually read. * * DESCRIPTION: Read from a file. * ******************************************************************************/ int acpi_os_read_file(ACPI_FILE file, void *buffer, acpi_size size, acpi_size count) { int length; length = fread(buffer, size, count, file); if (length < 0) { perror("Error reading file"); } return (length); } /******************************************************************************* * * FUNCTION: acpi_os_write_file * * PARAMETERS: file - An open file descriptor * buffer - Data buffer * size - Data block size * count - Number of data blocks * * RETURN: Number of bytes actually written. * * DESCRIPTION: Write to a file. * ******************************************************************************/ int acpi_os_write_file(ACPI_FILE file, void *buffer, acpi_size size, acpi_size count) { int length; length = fwrite(buffer, size, count, file); if (length < 0) { perror("Error writing file"); } return (length); } /******************************************************************************* * * FUNCTION: acpi_os_get_file_offset * * PARAMETERS: file - An open file descriptor * * RETURN: Current file pointer position. * * DESCRIPTION: Get current file offset. * ******************************************************************************/ long acpi_os_get_file_offset(ACPI_FILE file) { long offset; offset = ftell(file); return (offset); } /******************************************************************************* * * FUNCTION: acpi_os_set_file_offset * * PARAMETERS: file - An open file descriptor * offset - New file offset * from - From begin/end of file * * RETURN: Status * * DESCRIPTION: Set current file offset. * ******************************************************************************/ acpi_status acpi_os_set_file_offset(ACPI_FILE file, long offset, u8 from) { int ret = 0; if (from == ACPI_FILE_BEGIN) { ret = fseek(file, offset, SEEK_SET); } if (from == ACPI_FILE_END) { ret = fseek(file, offset, SEEK_END); } if (ret < 0) { return (AE_ERROR); } else { return (AE_OK); } }